FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/elink.c
1 /*
2 * Copyright (c) 1994 Charles Hannum. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Charles Hannum.
15 * 4. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: src/sys/i386/isa/elink.c,v 1.5.8.1 1999/09/05 08:12:33 peter Exp $
30 */
31
32 /*
33 * Common code for dealing with 3COM ethernet cards.
34 */
35
36 #include <sys/types.h>
37 #include <sys/cdefs.h>
38
39 #include <machine/cpufunc.h>
40
41 #include <i386/isa/elink.h>
42
43 /*
44 * Issue a `global reset' to all cards. We have to be careful to do this only
45 * once during autoconfig, to prevent resetting boards that have already been
46 * configured.
47 */
48 void
49 elink_reset()
50 {
51 static int x = 0;
52
53 if (x == 0) {
54 x = 1;
55 outb(ELINK_ID_PORT, ELINK_RESET);
56 }
57 }
58
59 /*
60 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
61 * bits are shifted in. Different board types use different polynomials.
62 */
63 void
64 elink_idseq(p)
65 register u_char p;
66 {
67 register int i;
68 register u_char c;
69
70 c = 0xff;
71 for (i = 255; i; i--) {
72 outb(ELINK_ID_PORT, c);
73 if (c & 0x80) {
74 c <<= 1;
75 c ^= p;
76 } else
77 c <<= 1;
78 }
79 }
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